I have checked your site using mobile device and don’t see issue with the double click. I’m able to open the product category https://gyazo.com/f6c6e1baf20eccf21d4dfa9700c48498 or product https://gyazo.com/c04b0976fa10d66bdb58d561e2fc6b9c from one click.
If I use wifi your site is fast on mobile device as you can see from my videos. But we would recommend you to optimize images to reduce the page size, for example I have tested images from your home page http://prntscr.com/sjlxfl You can save a lot using optimized images, try https://tinypng.com/ service for example, it gives good results.
Also, you may try other cache plugins and test speed results with other cache plugins because the one you use seems does not help to optimize some settings very well http://prntscr.com/sjlzra
If you need advanced help with personal site optimization contact WPKraken team. Our support team does not include personal optimization experts because it’s outside the scope of our support.
